[mod_webdav] allow Depth: Infinity lock on file (fixes #2296)

(still not supporting Depth: Infinity on directories)

patch by mstorsjo submitted as part of feature request #1953

From: Glenn Strauss <gstrauss@gluelogic.com>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@3133 152afb58-edef-0310-8abb-c4023f1b3aa9

NEWS

@@ -56,6 +56,7 @@ NEWS
   * [core] fixed the loading for default modules if they are specified explicitly
   * [core] lighttpd -tt performs preflight startup checks (fixes #411)
   * [stat] mimetype.xattr-name global config option (fixes #2631)
+  * [mod_webdav] allow Depth: Infinity lock on file (fixes #2296)
 
 - 1.4.39 - 2016-01-02
   * [core] fix memset_s call (fixes #2698)

src/mod_webdav.c

@@ -2218,11 +2218,13 @@ propmatch_cleanup:
 				hdr_if = ds->value;
 			}
 
-			/* we don't support Depth: Infinity on locks */
+			/* we don't support Depth: Infinity on directories */
 			if (hdr_if == NULL && depth == -1) {
-				con->http_status = 409; /* Conflict */
+				if (0 == stat(con->physical.path->ptr, &st) && S_ISDIR(st.st_mode)) {
+					con->http_status = 409; /* Conflict */
 
-				return HANDLER_FINISHED;
+					return HANDLER_FINISHED;
+				}
 			}
 
 			if (1 == webdav_parse_chunkqueue(srv, con, p, con->request_content_queue, &xml)) {